The Invisalign Tooth Whitening Pen is a convenient way to whiten teeth at home and on the go for a more confident smile. This simple whitening kit has a gentle formulation and a minty flavor that can safely be used up to 4 times daily to whiten teeth and freshen breath. You don't even have to rinse the solution will dissipate on its own. Note: If sensitivity occurs while using this tooth whitening kit, decrease the frequency of use. If irritation (such as redness, swelling, soreness) of the gums or mouth occurs, discontinue use, and consult your dentist. Adult supervision is required for use by children under 12. Avoid contact with eyes, skin, or hair flush with water if contact is made. Do not apply directly to gums or under tongue. Do not use if nursing or pregnant. Keep away from sunlight and heat as contents may pressurize.